My ex flirted with a friend?

My ex and I have gone two break ups. Mostly because of long-distance. One in November 2021 (mutual decisión) and another one month ago while I as in his hometown city, I told him that it’s better if we are friends because we share a buisness together and I don’t want to mix things. I regret telling him that because I want him back and miss him like crazy.

anyways, two friends of mine went to a party and my ex happen to be there. I’ve always noticed that my ex kind of liked this friend of mine and he said to her “you’re so pretty it’s a shame you’re Danielle’s friend) I’m Danielle.
i felt awful when my other best friend told me and I confronted my ex which he completely denied and told me that he was really drunk and don’t remember anything.

I need advice because I’m heartbroken even though he’s my ex and I ended things, I regret everything and we continue to have communication everyday but I feel betrayed by him.
My ex flirted with a friend?
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